<template>
  <div class="artice-container">
    <div class="article-container">
      <!-- 导航栏 -->
      <van-nav-bar
        @click-left="$router.back()"
        class="page-nav-bar"
        left-arrow
        title="黑马头条"
      ></van-nav-bar>

      <div class="main-wrap">
        <!-- 加载中 -->
        <div class="loading-wrap" v-if="loading">
          <van-loading color="#3296fa" vertical>加载中</van-loading>
        </div>

        <!-- 加载完成-文章详情 -->
        <div class="article-detail" v-else-if="article.title">
          <!-- 文章标题 -->
          <h1 class="article-title">{{ article.title }}</h1>

          <!-- 用户信息 -->
          <van-cell class="user-info" center :border="false">
            <van-image
              class="avatar"
              slot="icon"
              round
              fit="cover"
              :src="article.aut_photo"
            />
            <div slot="title" class="user-name">{{ article.aut_name }}</div>
            <div slot="label" class="publish-date">
              {{ article.pubdate | relativeTime }}
            </div>

            <!-- 关注 -->
            <FollowUser
              class="follow-btn"
              v-model="article.is_followed"
              :user-id="article.aut_id"
            />
          </van-cell>

          <!-- 文章内容 -->
          <div
            ref="article-content"
            class="article-content markdown-body"
            v-html="article.content"
          ></div>
          <van-divider>正文结束</van-divider>
          <CommentList
            :list="commentList"
            :source="article.art_id"
            @replay-click="onReplayClick"
            @onload-success="totalCommentCount = $event.total_count"
          />

          <van-popup v-model="isPostShow" position="bottom">
            <CommentPost
              @post-success="onPostSuccess"
              :target="article.art_id"
            />
          </van-popup>

          <!-- 底部区域 -->
          <div class="article-bottom">
            <van-button
              class="comment-btn"
              type="default"
              round
              size="small"
              @click="isPostShow = true"
              >写评论</van-button
            >
            <van-icon
              name="comment-o"
              :badge="totalCommentCount"
              color="#777"
            />

            <!-- 收藏 -->
            <!-- <van-icon color="#777" name="star-o" /> -->
            <CollectArticle
              :article-id="article.art_id"
              class="btn-item"
              v-model="article.is_collected"
            />
            <!-- 点赞 -->
            <!-- <van-icon color="#777" name="good-job-o" /> -->
            <LikeArticleVue
              :article-id="article.art_id"
              class="btn-item"
              v-model="article.attitude"
            />

            <van-icon name="share" color="#777777"></van-icon>
          </div>
        </div>

        <!-- 加载失败：404 -->
        <div v-else-if="errStatus === 404" class="error-wrap">
          <van-icon name="failure" />
          <p class="text">该资源不存在或已删除！</p>
        </div>

        <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
        <div v-else class="error-wrap">
          <van-icon name="failure" />
          <p class="text">内容加载失败！</p>
          <van-button @click="loadArticle" class="retry-btn"
            >点击重试</van-button
          >
        </div>
      </div>

      <!-- 评论回复 -->
      <van-popup v-model="isReplayShow" style="height: 100%" position="bottom">
        <CommentReply :comment="currentComment" @cross-btn="onCross" />
      </van-popup>
    </div>
  </div>
</template>

<script>
import CommentReply from './compoments/comment-reply'
import { getArticleById } from '@/api/article'
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user/index.vue'
import CommentList from './compoments/comment-list.vue'
import CommentPost from './compoments/comment-post.vue'
import CollectArticle from '@/components/collect-article/index.vue'
import LikeArticleVue from '@/components/like-article.vue/index.vue'

export default {
  name: 'ArticleIndex',
  provide: function () {
    return {
      articleId: this.articleId
    }
  },
  data () {
    return {
      article: {},
      loading: true,
      errStatus: 0,
      totalCommentCount: 0,
      isPostShow: false,
      isReplayShow: false,
      commentList: [],
      currentComment: {} // 评论数据
    }
  },
  props: {
    articleId: {
      type: [Number, String, Object],
      required: true
    }
  },
  methods: {
    async loadArticle () {
      this.loading = true
      try {
        const { data } = await getArticleById(this.articleId)
        if (Math.random() > 0.5) {
          JSON.parse('123')
        }
        this.article = data.data

        setTimeout(() => {
          this.previewImage()
        }, 0)
      } catch (err) {
        if (err.response && err.response.status === 404) {
          this.errStatus = 404
        }
        this.$toast('获取失败', err)
      }
      this.loading = false
    },
    previewImage () {
      // 得到img节点
      const articleContent = this.$refs['article-content']
      const imgs = articleContent.querySelectorAll('img')
      const images = []
      imgs.forEach((img, index) => {
        images.push(img.src)
        img.onclick = () => {
          ImagePreview({
            // 图片预览地址数组
            images,
            // 起始位置，从0开始
            startPosition: index
          })
        }
      })
    },
    onPostSuccess (data) {
      this.isPostShow = false
      this.commentList.unshift(data.new_obj)
    },
    onReplayClick (comment) {
      console.log(comment)
      this.currentComment = comment
      this.isReplayShow = true
    },
    onCross () {
      this.isReplayShow = false
    }
  },
  created () {
    this.loadArticle()
  },
  components: {
    FollowUser,
    CommentList,
    CommentReply,
    CommentPost,
    CollectArticle,
    LikeArticleVue
  }
}
</script>

<style scoped lang="less">
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 41px;
    bottom: 44px;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 20px;
      padding: 25px 16px;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 16px;
      .avatar {
        width: 35px;
        height: 35px;
        margin-right: 8px;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 12px;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 11px;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 85px;
        height: 33px;
      }
    }

    .article-content {
      padding: 23px 16px;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 100px 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 100px 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    .van-icon {
      font-size: 61px;
      color: #b4b4b4;
    }
    .text {
      font-size: 15px;
      color: #666666;
      margin: 11px 0 23px;
    }
    .retry-btn {
      width: 140px;
      height: 35px;
      line-height: 35px;
      border: 1px solid #c3c3c3;
      font-size: 15px;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 44px;
    border-top: 1px solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 141px;
      height: 23px;
      border: 1px solid #eeeeee;
      font-size: 15px;
      line-height: 23px;
      color: #a7a7a7;
    }
    /deep/ .van-icon {
      font-size: 20px;
      .van-info {
        font-size: 8px;
        background-color: #e22829;
      }
    }
  }
}
</style>
